SimpleTemplate

SimpleTemplate.php

<?php

class SimpleTemplate {

	function renderString($string, $args = NULL) {
		if(is_array($args)) {
			$this->validateArgs($args);
			extract($args);
		}
		eval('?>' . $this->parseString($string));
	}

	function render($file, $args = NULL) {
		if(is_array($args)) {
			$this->validateArgs($args);
			extract($args);
		}
		eval('?>' . $this->parse($file));
	}

	function compileString($string, $args = NULL) {
		if(is_array($args)) {
			$this->validateArgs($args);
			extract($args);
		}
		ob_start();
		eval('?>' . $this->parseString($string));
		return ob_get_clean();
	}

	function compile($file, $args = NULL) {
		if(is_array($args)) {
			$this->validateArgs($args);
			extract($args);
		}
		ob_start();
		eval('?>' . $this->parse($file));
		return ob_get_clean();
	}

	private function validateArgs($args) {
		if(isset($args['file']) || isset($args['args']) || isset($args['this'])) {
			throw new Exception('Invalid arguments.');
		}
	}

	private function parseString($string) {
		$string = str_replace("\r", '', $string);
		$length = strlen($string);
		$result = '';
		$state  = 0;
		for($i = 0; $i < $length; $i++) {
			$char = $string[$i];
			switch($state) {
				case 0:
					switch($char) {
						case '@':
							$result .= '<?php ';
							$state = 1;
							break;
						case '{':
							$result .= '<?php ';
							$state = 2;
							break;
						case '\\':
							$state = 8;
							break;
						default:
							$result .= $char;
					}
					break;
				case 1:
					if($char == "\n") {
						$result .= ' ?>' . $char;
						$state = 0;
					} else {
						$result .= $char;
					}
					break;
				case 2:
					switch($char) {
						case '{':
							$state = 3;
							break;
						case '=':
							$result .= 'echo ';
							$state = 4;
							break;
						case '?':
							$result .= 'echo urlencode(';
							$state = 5;
							break;
						default:
							$result .= 'echo htmlspecialchars(' . $char;
							$state = 6;

					}
					break;
				case 3:
					if($char == '}') {
						$state = 7;
					} else {
						$result .= $char;
					}
					break;
				case 4:
					if($char == '}') {
						$result .= ' ?>';
						$state = 0;
					} else {
						$result .= $char;
					}
					break;
				case 5:
				case 6:
					if($char == '}') {
						$result .= ') ?>';
						$state = 0;
					} else {
						$result .= $char;
					}
					break;
				case 7:
					if($char == '}') {
						$result .= ' ?>';
						$state = 0;
					} else {
						$result .= '}' . $char;
						$state = 3;
					}
					break;
				case 8:
					switch($char) {
						case '@':
							$result .= $char;
							$state = 0;
							break;
						case '{':
							$result .= $char;
							$state = 0;
							break;
						case '\\':
							$result .= '\\' . $char;
							$state = 0;
							break;
					}
					break;
			}
		}
		return $result;
	}

	private function parse($file) {
		if(!is_file($file)) {
			throw new Exception('Template file "' . $file . '" is not found.');
		}
		return $this->parseString(
				file_get_contents($file)
			);
	}
}